Early stage ettringite and monosulfoaluminate carbonation investigated by in situ Raman spectroscopy coupled with principal component analysis - Université Gustave Eiffel Access content directly
Journal Articles Materials Today Communications Year : 2023

Early stage ettringite and monosulfoaluminate carbonation investigated by in situ Raman spectroscopy coupled with principal component analysis

Abstract

This study investigates the early stages of monosulfoaluminate and ettringite carbonation using nondestructive in situ Raman spectroscopy monitoring. Coupling this technique with Principal Components Analysis enables relevant information to be extracted from spectral data such as an accurate identification of the beginning of the reaction and of specific chemical phases. These two hydrates and some of their carbonation products can be well detected using this vibrational spectroscopy technique. Experiments were conducted on two pastes of hydrated yeelimite, in the presence and in the absence of gypsum respectively, during their carbonation. The results confirmed the detection of the beginning of the carbonation and allowed us to identify some consumed and formed chemical phases in the early stages of the reaction. These outcomes of in situ Raman spectroscopy monitoring study on cementitious phases could help understand the early chemical modifications occurring in complex environments such as cement pastes.
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Dates and versions

hal-04019304 , version 1 (08-03-2023)

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Mohamed-Nadjib Brahim, Jean-Michel Mechling, Sarah Janvier-Badosa, Mario Marchetti. Early stage ettringite and monosulfoaluminate carbonation investigated by in situ Raman spectroscopy coupled with principal component analysis. Materials Today Communications, 2023, 35, pp.105539. ⟨10.1016/j.mtcomm.2023.105539⟩. ⟨hal-04019304⟩
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